Nurse your batteries

If you are using AA or AAA sized rechargeable Ni-MH batteries with your electronic devices,there is a temptation to recharge them even before they run out of power.Do not do it.Ni-MH batteries have what people call the "memory effect".This means that the battery eventually remembers how much charge it used and will only provide that same amount the next time you use it(i.e their battery life decreases).Instead,always keep two sets of batteries - only recharge the first set when it runs dry,replacing them with the second set to keep your devices running.Alternate between the two sets.(Note:this doesn't apply to lithium-ion batteries.